INTEGRATED CIRCUITS
DATA SHEET
PCA167x series
32 kHz watch circuits using a
silver-oxide or a 3 V lithium battery
Product specification
Supersedes data of 1997 Apr 22
File under Integrated Circuits, IC16
1998 Apr 03
Philips Semiconductors
Product specification
32 kHz watch circuits using a silver-oxide
or a 3 V lithium battery
FEATURES
•
32 kHz oscillator, amplitude regulated with excellent
frequency stability
•
High immunity of the oscillator to leakage currents
•
Very low current consumption; typically 150 nA
•
Stop function for accurate timing
•
Chopped motor pulses available
•
Power-on reset for fast testing
•
Various test modes for testing the mechanical parts of
the watch and the IC.
ORDERING INFORMATION
TYPE
NUMBER
PCA1672U
PCA1673U
PCA1675U
PCA1676U/10
PCA1677U
Note
PACKAGE
(1)
NAME
−
−
−
−
−
chip in tray
chip in tray
chip in tray
chip on foil
chip in tray
DESCRIPTION
GENERAL DESCRIPTION
PCA167x series
The PCA167x series devices are CMOS integrated circuits
specially suited for battery-operated,
quartz-crystal-controlled wrist-watches, with a bipolar
stepping motor.
VERSION
−
−
−
−
−
1. Figure 1 and Chapter “Package outline” show details of standard package, available for large orders only.
Chapter “Chip dimensions and bonding pad locations” shows exact pad locations for other delivery formats.
PINNING
SYMBOL
V
SS
TEST
OSC IN
OSC OUT
V
DD
M1
M2
RESET
PIN
1
2
3
4
5
6
7
8
DESCRIPTION
ground (0 V)
test output
oscillator input
oscillator output
positive supply voltage
motor 1 output
motor 2 output
reset input
VSS
TEST
OSC IN
OSC OUT
1
2
8
7
RESET
M2
M1
V DD
PCA167xT
3
4
MSA978
6
5
Fig.1 Pin configuration, PCA167xT, (PMFP8).
1998 Apr 03
2
Philips Semiconductors
Product specification
32 kHz watch circuits using a silver-oxide
or a 3 V lithium battery
FUNCTIONAL DESCRIPTION AND TESTING
Motor pulse
The motor output pulse widths (t
P
) and the cycle times (t
T
)
are given in Chapter “Available types”.
Power-on reset
For correct operation of the Power-on reset the rise time of
V
DD
from 0 V to 1.55 V should be less than 0.1 ms.
All resettable flip-flops are reset. Additionally the polarity of
the first motor pulse is positive: V
M1
−
V
M2
≥
0 V.
PCA167x series
Customer testing and stop mode
An output frequency of 32 Hz is provided at RESET (pin 8)
to be used for exact frequency measurement.
Connecting the RESET to V
DD
stops the motor pulses
leaving them in a HIGH impedance 3-state condition and a
32 Hz signal is produced at the TEST pin. A debounce
circuit protects against accidental stoppages due to
mechanical shock to the watch (t
DEB
= 14.7 to 123.2 ms).
Connecting RESET to V
SS
activates the test mode.
The motor pulse period is 31.25 ms instead of t
T
. Test and
stop mode are disabled by disconnecting RESET
(open-circuit).
AVAILABLE TYPES
Refer to Fig.2 and to Chapters “Ordering information” and “Functional description and testing”.
SPECIFICATIONS
SHORT
TYPE
NUMBER
1672
1673
1675
1676
1677
Note
1. U = Chip in trays; U/10 = chip on foil.
DELIVERY
FORMAT
(1)
U
U
U
U/10
U
PERIOD
t
T
(s)
1
1
1/16
10
10
PULSE
WIDTH t
P
(ms)
7.8
5.8
5.8
5.8
7.8
DRIVE
(%)
56
56
100
56
100
EEPROM
no
no
no
no
no
BATTERY
EOL
DETECTION
no
no
no
no
no
REMARKS
3 V Lithium
3 V Lithium
no oscillator
3 V Lithium
1.5 V
V M1 - M2
tT
2t T
MSA977
tP
Fig.2 Motor output waveform (normal operation).
1998 Apr 03
3
Philips Semiconductors
Product specification
32 kHz watch circuits using a silver-oxide
or a 3 V lithium battery
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOL
V
DD
V
I
T
amb
T
stg
Note
PARAMETER
supply voltage
all input voltages
output short-circuit duration
operating ambient temperature
storage temperature
−10
−30
CONDITIONS
V
SS
= 0 V; note 1
V
SS
MIN.
−1.8
PCA167x series
MAX.
+6
V
DD
indefinite
+60
+100
°C
°C
V
V
UNIT
1. Connecting the battery with reversed polarity does not destroy the circuit, but in this condition a large current flows,
which will rapidly discharge the battery.
HANDLING
Inputs and outputs are protected against electrostatic discharges in normal handling. However, to be totally safe, it is
advisable to take handling precautions appropriate to handling MOS devices. Advice can be found in
“Data Handbook IC16, General, Handling MOS Devices”.
CHARACTERISTICS
V
DD
= 1.55 V; V
SS
= 0 V; f
osc
= 32.768 kHz; T
amb
= 25
°C;
crystal: R
S
= 20 kΩ; C
1
= 2 to 3 fF; C
L
= 8 to 10 pF;
C
0
= 1 to 3 pF; unless otherwise specified.
SYMBOL
Supply
V
DD
∆V
DD
I
DD1
I
DD2
I
DD3
I
DD4
supply voltage
supply voltage variation
supply current
supply current
supply current
supply current
T
amb
=
−10
to +60
°C
transient;
V
DD
= 1.2 to 3.5 V
between motor pulses
between motor pulses;
V
DD
= 3.5 V
stop mode; pin 8
connected to V
DD
stop mode; pin 8
connected to V
DD
;
V
DD
= 3.5 V
1.2
−
−
−
−
−
1.5
−
150
200
180
300
3.5
0.25
250
350
300
480
V
V
nA
nA
nA
nA
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
1998 Apr 03
4
Philips Semiconductors
Product specification
32 kHz watch circuits using a silver-oxide
or a 3 V lithium battery
SYMBOL
Motor output
V
sat
R
sc
t
T
t
P
Oscillator
V
OSC ST
g
m
t
osc
∆f/f
C
i
C
o
Reset input
f
o
∆V
o
t
edge
I
im
I
i(av)
Test mode
t
T1
t
DEB
Notes
cycle time
debounce time
RESET = V
DD
−
14.7
31.25
−
output frequency
output voltage swing
edge time
peak input current
average input current
R = 1 MΩ; C = 10 pF
R = 1 MΩ; C = 10 pF
note 3
−
1.4
−
−
−
32
−
1
320
10
starting voltage
transconductance
start-up time
frequency stability
input capacitance
output capacitance
∆V
DD
= 100 mV
V
i(p-p)
= 50 mV
1.2
6
−
−
−
19
−
15
1
saturation voltage
Σ
(P + N)
short-circuit resistance
Σ
(P + N)
cycle time
pulse width
R
L
= 2 kΩ;
T
amb
=
−10
to +60
°C
I
transistor
< 1 mA
−
−
150
200
PARAMETER
CONDITIONS
MIN.
PCA167x series
TYP.
MAX.
UNIT
200
300
note 1
note 2
−
−
−
0.3
×
10
−6
−
29
−
−
−
−
−
−
123.2
mV
Ω
V
µS
s
pF
pF
0.05
×
10
−6
3
24
Hz
V
µs
nA
nA
ms
ms
1. Cycle time can be changed to one of the following values: 1, 5, 10, 12 or 20 s (see Chapter “Available types”).
2. Pulse width can be varied from 2 ms to 15.7 ms in steps of 1 ms (see Chapter “Available types”).
3. Duty factor is 1 : 32 and RESET = V
DD
or V
SS
.
1998 Apr 03
5
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